Yeah that's cool just get some sort of water test kit to check it first for basic stuff to make sure it's fit for fish!
Keep this in mind paddle if you going to drain it soon say in a year or so you can do what you want if your going to drain and kill it off. So if you want some LMB in there to kill of some of the bullheads then do it if your dead set on draining and killing it off at some point in the near future. Now is your time to expierment if your going to break it all down in the next year. But if you going to leave it alone for a while I would try to come up with a better plan of action for stocking.
Good Luck it looks like a nice pond and something to work with!!
RC
